Michael Phelps

The Olympic star's golf career has been fruitful enough to land a Golf Digest cover, a Golf Channel show, and an endorsement contract with Ping. "This is a passion that I have and I'm going to do everything I can to improve and get to where I want to be. I have friends that are single-digit and scratch golfers that I would love to be able to compete with," Phelps told Golf World's E. Michael Johnson. "I know it is a very challenging sport. It's the most humbling sport I've ever played in my life."